<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0"
          name="viewport">
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    <title>Document</title>
    <link href="../boot/css/bootstrap.min.css" rel="stylesheet">
    <!--核心jquery js-->
    <script src="../boot/js/jquery-3.4.1.min.js"></script>
    <!--bootstrap 核心 js-->
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</head>
<body>
<div class="btn-group">
    <button class="btn btn-default">普通按钮组</button>
    <button class="btn btn-default">普通按钮组</button>
    <button class="btn btn-default">普通按钮组</button>
</div>
<div class="btn-toolbar">
    <div class="btn-group">
        <button class="btn btn-default">按钮工具栏包含按钮组</button>
        <button class="btn btn-default">按钮工具栏包含按钮组</button>
        <button class="btn btn-default">按钮工具栏包含按钮组</button>
    </div>
</div>
<div class="btn-group btn-group-xs">
    <button class="btn btn-default">xs按钮组</button>
    <button class="btn btn-default">xs按钮组</button>
    <button class="btn btn-default">xs按钮组</button>
</div>
<div class="btn-group btn-group-sm">
    <button class="btn btn-default">sm按钮组</button>
    <button class="btn btn-default">sm按钮组</button>
    <button class="btn btn-default">sm按钮组</button>
</div>
<div class="btn-group btn-group-lg">
    <button class="btn btn-default">lg按钮组</button>
    <button class="btn btn-default">lg按钮组</button>
    <button class="btn btn-default">lg按钮组</button>
</div>
<div class="btn-group">
    <button class="btn btn-default">普通按钮组</button>
    <button class="btn btn-default">普通按钮组</button>
    <div class="btn-group">
        <button class="btn btn-default" data-toggle="dropdown">按钮组嵌套按钮组的选择 <span class="caret"></span></button>
        <ul class="dropdown-menu">
            <li>a</li>
            <li>b</li>
        </ul>
    </div>
</div>
<br>

</body>
</html>